Animation builder is a tool to create animations with a Livecode stack. Every time you make a change in a stack, you can create a frame of the animation. The animation builder collect all changes in a timeline and create the animation. You can find it in Development -> Plugins -> revAnimation:
Or you can downland it from: http://www.maxvessi.net/livecode/public/revanimation.rev and put in the plugins folder For every you can select the speed of the change and other values.